That puts it in perscective, if you are mainly useing the 135mm f/2.0 bare and using the extender for mainly for added reach stopped down in landscapes then I can see your point. Also by your second last post I was under the impresion that you wanted both extenders which added weight and cost instead of just one.
I think you should definetely try out the 70-200mm f/2.8 IS and the 135mm with a extender before you make up your mind, it seems you are a little overly cautions about adding weight., It's really easy to get caught up in the specs vs real world. I carry in my hands the 600mm f/6.3 (5.6 lbs) with 2x extender, flash, better beamer and 60D and about 5lbs of other gear in a bag slung on my shoulder, if you added up all the specs you would think that would be FAR to heavy to carry around for hours hiking but in reality it's not that bad.
John.
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